I hear you craiger. I grew tired of looking around for a decretive cover with no luck either. I used the antenna base to pattern a shape and just made my own plate out of thin aluminum plus a rubber backing of the same shape. From there I drilled a hole and counter sunk it so I could run a screw up flush on the outside and a small anchor plate on the inside. It looked well once I polished the plate to a high shine.
Edge